diff --git a/nmap_dns.h b/nmap_dns.h
index 942b6253d..71f4d24e6 100644
--- a/nmap_dns.h
+++ b/nmap_dns.h
@@ -97,6 +97,9 @@
 
 class Target;
 
+#include <string>
+#include <list>
+
 void nmap_mass_rdns(Target ** targets, int num_targets);
 const char *lookup_cached_host(u32 ip);